Need a Java map/table with multiple keys to one value. Value is commonly altered

Question

What I need is a collection which allows multiple keys to access a single object.

I need to apply frequent alterations to this object.

It also must be effici

Answer 1

Uhm…

Map map = new HashMap();
Object someValue = new Object();
map.put(new Object(), someValue);
map.put(new Object(), someValue);

Now the map contains the same value twice, accessible via different keys. If that’s not what you’re looking for you should rework your question. :)